Gum



PatentedJaml, 193s Q 7 7' n s I UNITED I STATES PATEINTTTQFFICE Taliaferro J. Fairley, Alexandria, La., assignor, by

direct andmesne assignments, of one-hall to W. J. Hunter and one-half to Mary P. Hunter, both of Shreveport, La.

No Drawing. Application July 6,1931,

Serial No. 549,119

4 Claims. (Cl. 134-17) The present invention relates to the manuobtained can be mixed with a suitable drier, facture of avarnish gum, comprising a product pigment and thinner. For driers'I may use the obtained by treating the distillate or oil which is oxides of cobalt, manganese or lead, and as a the subject matter of an application executed thinner, Imay use turpentineor the well known I 5 by methis day, and entitled Process'of treating mineral oil. distillate boiling between gasolene 5 I rubber, filed July 6, 1931, Serial No. 549,118. and kerosene. s a

The distillate employed comprises the frac- It appears thatthe distillate or oil subjected.

tions obtained by distilling vulcanized rubber to to the treatment which I have outlined above is substantial dryness or up to a temperature .of polymerized, and as stated, I have found the about 400 C., "condensing all of the resultant polymerizedgum to be superior to the so-called 10 vapors, and collecting the various fractions as a varnish gums which are now in commercial us single distillate, or the distillate may comprise for varnishmaking. 7 those fractions obtainedby distilling vulcanized The gum which is the product of 'my invenrubber to substantial dryness in a vacuum using tion willberesistant to the action of acids, al-.

lower temperatures. In each case, the fractions kalies, and wholly insoluble in water, When 15 are condensed and collected as a single distillate. incorporated with my distillate which of itself is By a varnish gum, I mean the gum generally a drying oil, the solution will be likewise resistant understood by this term in varnish manufacture to acids, alkalies, alcohol, and waterproof. with which is usually. added an oil, a drier, a Moreover, both the gum and the solution formed thinner, and a pigment. by incorporating it with my distillate will be re- 20 In preparing my improved gum, I mix with sistant to heat and coldness, so that a varnish the distillate or oil obtained as described above prep r With t ese; materials will withstand to or in accordance with my aforesaid application, much greater degree, the various conditions una dilute solution of nitric acid. The mass is der which varnishes-are used.-

heated andagitated until reaction takes place, Thus a varnish having these materials incor- 2 5 which will generally be indicated by violent porated therein will be resistant to hot and cold foaming. In referring to dilute nitric acid, I water as well as acids, alkalies and alcohol, mean .a substantially 50% solution which of While I have referredto nitric acid, I may course may be varied ifrequired. .The quantity use other acids to promote the polymerization of acid solution employed will vary from vpossibly as for example, organic acids as well as other 30 10 to 25% by volume, with respect to the oil. of the inorganic acids.

When violent foaming is observed, the heating I claim: I and agitation is discontinued and the. mass 1. The process of preparing a varnish gum cooled. For this purpose, the reaction is 'carwhich comprises subjecting vulcanized rubber to ried out in a jacketed vessel so that the cooling destructive distillation up to about 400 C., con- 35 may beaccomplished by passing a cooling fluid tinuing the distillation until adry residue is obabout the wall containing, the reaction product. tained, collecting the resulting mixture of va- In most cases the agitation willbe'continued pors as a single distillate, heating thefsaid disduring the cooling operation to assure a more tillate in contact with nitric acid, and cooling 1 40' rapid cooling. v I the reaction product. 40

It will be understood that the agitation during. 2. The process of preparing a varnish gum the reaction period is resorted to, to prevent any which comprises subjecting vulcanized rubber. "possibility of burning. a to destructive-distillation, continuing the distilla- The resultant product after the cooling operaa tion until a dry residue is obtained, collecting the a tion is a heavy viscous material, and resembles resulting mixture of vapors as a single distillate, 45 v a a soft varnish gum. heating and agitating the said distillate with It is possible thatsome water will remain in dilutenitric acid until reaction occurs,-and cool: the gum, and this can be drawn off from the ing the reaction'product. reaction vessel and thereafter in order to com- 3. A varnish gumcomprising the product repletely dry the gum, it can be placed in a suitsulting from the process of claim 1. v V

, able oven or vacuum drier to completely remove 4. A varnish gum'kcomprising the product reany traces of moisture. sulting from the process of claim ,2. a

The final product can be thinned with my aforesaid oil or' distillate, and thesolution so TALIAFERRO J. FAIRLEY. 

